Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . aisson and boat passes over drums onone carriage, and that which sus]iends the othercaisson and boat jiasses over the drums on anothercarriage ; the chain at each end of the lift being , pas-ing in continuity over the diflerent dramsand around the long shaft at the side of the frame-work, so that, as the shaft revolves, the chain windson one set of drums
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . aisson and boat passes over drums onone carriage, and that which sus]iends the othercaisson and boat jiasses over the drums on anothercarriage ; the chain at each end of the lift being , pas-ing in continuity over the diflerent dramsand around the long shaft at the side of the frame-work, so that, as the shaft revolves, the chain windson one set of drums and unwinds from the other,one boat rising as the other action is as follows : — LIFT. 1304 LIFT-GATE. *Two boats approaching the lift from contrary di-rections are lluated over tile sunken caissons in thelower and upper basins respectively. The load isunirorin, wliether the caisson contain a boat orotluTwise, as the caissoU is full of water in eithercase, and the boat displaces a weight of water exact-ly equal to its own weight. Tlie shaft s is rotatedby steam or water power, and the chains wind onthe cams c c, causing the upp<T shaft» to move downin the framework and draw the caissons with their Fig. Canal-Lift (-Great Westfm Catial of England). loads out of the water. The weight of the caissonis balanced by a weight w, which acts by a sliort orlong leverage on the cams, according to the positionof the caissons in or out of the water buckets b b suspended from the shaft s may befilled as required to assist the power in working theshaft. The caissons being lifted out of the water, theupper caisson is moved on the railway across the canal, so as to be suspended over the lower basin,ready to descend. When in this position the two caissons are ineiiuilibrium, each susjiended clear of the water, andover the lower basin, the ujiper one occupying thejiosition ill dotted lines a. The eqidlibrium is thenilistiirbed, by allowing some water to
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